Dissection of the medial wall of the thalamus and hypothalamus has now exposed the entire column of the fornix, the mammillothalamic tract and the fasciculus retroflexus. Some gray matter partially covers the latter tract. The internal course of several of the posterior perforating arteries can be followed in the dissected area. Within the meninges filling the transverse fissure a choroidal branch of the posterior cerebral artery is visible.

1
.

Fornix (body)

2
.

Choroid plexus third ventricle (note the continuation of this plexus through the interventricular foramen)